310 Dr. \V. T. Ci.lman on the 



XXVI. — The F7ofott/pe of Arnvnothon carolitiensis, Lfach 

 {Fycvoijonida). By \V. T. COALMAN, l).Si\ 



(Published by permission of the Trustees of the British MustMim.) 



Just a century ago, in tie first volnnie of liis ' Zoolooical 

 Miscellany' (pp. 33-34, pi. xiii.) *, Dr. W. E. Leadi 

 described and figured a new species ot Pycnogonid, vvliicli lie 

 })laced in a new genus under the name Amvwfhea caro/inensis. 

 Loinan t I'^s pointed out tliat, according to the original 

 description and figure, Leach's species is not congeneric with 

 the tnajiirity of species that have since been referred to 

 Amiuothea, but belongs to the group to which tiie name 

 Leionymjjhon^ Mobius :{:, has been given. This conclusion 

 has been accepted, and the consequent changes in nomen- 

 clature have been made, by Bouvier and by Hodgson. 



One of the two specimens described by Leach is preserved 

 in the British Museum and, although not quite unscathed by 

 the accidents of a hundred years, it is still in fair condition. 

 As Loman's discussion is based solely on Leach's description 

 and figure §, it seems desirable to place on record some 

 further details regarding this specimen, which must now be 

 accepted as the holotype of the species. 



Description. — The specimen is immature, as is shown by 

 the chelate condition of the chelophores and the shortness 

 of the ovigers. The body appears to be somewhat shortened 

 by contraction in drying. 



Lateral processes separated by intervals of less than half 

 their diameter, each with a slight distal ridge which is veiy 

 indistinctly bilobed. 



Transverse bo(ft/-rid(jes very prominent, rising into acutely 

 conic.d median processes with the points directed obliquely 

 forwards. 



Cephalon about twice as wide as long. Ocular tuhtrcle 



* Hoek (' Challenfrer ' Rep. Pycnogoiiida, p. 23, 1881) gives the date as 

 ]815, but Mr. C. D. Sherborn assures me that th^re is uo reason for 

 doubting the date 1814 given on Leach's titlepage. 



t Pantopoden d. fcJiboga-Exp. p. 10 (19U8J. 



X Pantopoden d. deulscheu Tiefsee-Exp. p. 183 (1902). 



§ It IS not correct to state, as iiudgson dues (^Ann. & Mag. Nat. Hist, 

 (8) XV. p. 140, 1915), that " Loniau has called attention to the type- 

 epecimen of Leach now preserved in the British Museum." Loman 

 iiiake.^ no reference to the sijec-,in:en, and I am not aware that he took any 

 steps to discover whether it still '?.\isled. 



